Fritzbox 7170 connected directly to the "TAE" / No Splitter!

Yes, it is somewhat complicated. You'll need a proper cable to do that. And it seems you have to build it yourself. I'm still gathering information on that.

Nah, it has changed a bit. Watch the spectrum.

The spectrum is more square-edged or steppy between 64 and 90 kHz while the signal/noise quality is rounder. Also, I gained one dB in Signal/Noise-ratio... Yay!

Sole downer: lost 4 Kbit/s of potential upstream.. :)